<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区域 -->
    <el-card>
      <!-- alert 警告框 -->
      <el-alert title="添加商品信息" type="info" show-icon center></el-alert>

      <!-- 步骤条区域 -->
      <el-steps :space="200" :active="activeIndex - 0" finish-status="success" align-center>
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>

      <!-- Tab栏区域 -->
       <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
        <el-tabs v-model="activeIndex" :tab-position="'left'" :before-leave="beforeTabLeave" @tab-click="tabClicked">
            <el-tab-pane label="基本信息" name="0">
                <el-form-item label="商品名称" prop="goods_name">
                    <el-input v-model="addForm.goods_name"></el-input>
                </el-form-item>
                <el-form-item label="商品价格" prop="goods_price">
                    <el-input v-model="addForm.goods_price" type="number"></el-input>
                </el-form-item>
                <el-form-item label="商品重量" prop="goods_weight">
                    <el-input v-model="addForm.goods_weight" type="number"></el-input>
                </el-form-item>
                <el-form-item label="商品数量" prop="goods_number">
                    <el-input v-model="addForm.goods_number" type="number"></el-input>
                </el-form-item>
                <el-form-item label="商品分类" prop="">                    
                    <el-cascader expand-trigger="hover" :options="catelist" :props="cateProps" v-model="addForm.goods_cat" @change="handleChange">
                    </el-cascader>
                </el-form-item>                
            </el-tab-pane>
            <el-tab-pane label="商品参数" name="1">
                <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id">
                    <el-checkbox-group v-model="item.attr_vals">
                        <el-checkbox :label="cb" v-for="(cb, i) in item.attr_vals" :key="i" border></el-checkbox>                        
                    </el-checkbox-group>
                </el-form-item>
            </el-tab-pane>
            <el-tab-pane label="商品属性" name="2">
                <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
                    <el-input v-model="item.attr_vals"></el-input>
                </el-form-item>
            </el-tab-pane>
            <el-tab-pane label="商品图片" name="3">
                <!-- action 表示图片要上传的后台API地址 -->
                <el-upload :action="uploadURL" :on-preview="handlePreview" :on-remove="handleRemove" list-type="picture" :headers="headerObj" :on-success="handleSuccess">
                    <el-button size="small" type="primary">点击上传</el-button>                    
                </el-upload>
            </el-tab-pane>
            <el-tab-pane label="商品内容" name="4">
                <!-- 富文本编辑器组件 -->
                <quill-editor v-model="addForm.goods_introduce"></quill-editor>
                <!-- 添加商品按钮 -->
                <el-button type="primary" class="btnAdd"  @click="add">添加商品</el-button>
            </el-tab-pane>        
        </el-tabs>
      </el-form>
    </el-card>

    <!-- 图片预览区域 -->
    <el-dialog title="图片预览" :visible.sync="previewVisible" width="50%">
        <img :src="previewPath" alt="" class="previewImg">    
    </el-dialog>
  </div>
</template>

<script>
import _ from 'lodash'

export default {
  data() {
    return {
        activeIndex: 0,
        // 添加商品表单数据对象
        addForm: {
            goods_name: '',
            goods_price: 0,
            goods_weight: 0,
            goods_number: 0,
            // 商品所属分类组
            goods_cat:[],
            // 图片的数组
            pics: [],
            // 商品的详情描述
            goods_introduce: '',
            attrs:[]
        },
        addFormRules: {
            goods_name:[
                {required: true, message: '请输入商品名称', tigger: 'bulr'}
            ],
            goods_price:[
                {required: true, message: '请输入商品价格', tigger: 'bulr'}
            ],
            goods_weight:[
                {required: true, message: '请输入商品重量', tigger: 'bulr'}
            ],
            goods_number:[
                {required: true, message: '请输入商品数量', tigger: 'bulr'}
            ],
             goods_cat:[
                {required: true, message: '请选择商品分类', tigger: 'bulr'}
            ]
        },
        // 商品分类列表
        catelist: [],
        cateProps: {
            label: 'cat_name',
            value: 'cat_id',
            children: 'children'
        },
        // 动态生成的参数列表
        manyTableData: [],
        // 静态属性列表
        onlyTableData: [],
        // 上传图片地址
        uploadURL: 'http://127.0.0.1:8888/api/private/v1/upload',
        // 图片上传组件的headers请求头对象
        headerObj: {
            Authorization:window.sessionStorage.getItem('token')
        },
        previewPath: '',
        // 图片预览 显示与隐藏
        previewVisible:false,
        
    }
  },
  created() {
      this.getCateList()
  },
  methods: {
      async getCateList() {
          const {data : res} = await this.$http.get('categories')

          if(res.meta.status !== 200) {
              return this.$message.error('获取商品列表失败！')
          }
          
          this.catelist = res.data
        //   console.log(this.catelist);   

      },
    //   级联选择器选中项变化，会触发这个函数
      handleChange() {
          if(this.addForm.goods_cat.length !==3) {
              this.addForm.goods_cat = ''
          }          
      },
      beforeTabLeave(activeName, oldactiveName) {
          if(oldactiveName === '0' && this.addForm.goods_cat.length !==3){
              this.$message.error('请选择商品分类')
              return false
          }
      },
      async tabClicked(){
        //   console.log(this.activeIndex);
        if(this.activeIndex === '1') {
            const {data : res} = await this.$http.get(`categories/${this.cateId}/attributes`,{
                params: {sel: 'many'}
            })
            if(res.meta.status !== 200) {
                return this.$message.error('获取动态参数列表失败！')
            }
            // console.log(res.data);

            res.data.forEach ( item => {
                item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
            })

            this.manyTableData = res.data            
        } else if(this.activeIndex === '2') {
            const {data : res} = await this.$http.get(`categories/${this.cateId}/attributes`,{
                params: {sel: 'only'}
            })
            if(res.meta.status !== 200) {
                return this.$message.error('获取动态参数列表失败！')
            }
            // console.log(res.data);
            this.onlyTableData = res.data           

        }
          
      },
    //   处理图片预览效果
      handlePreview(file) {
        //   console.log(file);
          this.previewPath = file.response.data.url
          this.previewVisible = true         


      },
    //   处理移除图片操作
      handleRemove(file) {
          // 1. 获取将要删除的图片的临时路径
          const filePath = file.response.data.tmp_path
          // 2. 从pics 数组中，找到这个图片对应的索引值
          const i = this.addForm.pics.findIndex(x => x.pic === filePath)
          // 3. 调用数组的splice 方法，把图片信息对象，从pics 数组中移除
          this.addForm.pics.splice(i, 1)
        //   console.log(this.addForm);
          

      },
    //   监听图片上传成功的事件
      handleSuccess(response) {
        //   console.log(response);
        // 1. 拼接得到一个图片信息对象
        const picInfo = {pic : response.data.tmp_path}
        // 2. 将图片信息对象，push到pics数组中
        this.addForm.pics.push(picInfo)

        // console.log(this.addForm);
        
          
          
      },
    //   添加商品
      add(){
        //   console.log(this.addForm);
        this.$refs.addFormRef.validate(async valid => {
            if(!valid) {
                return this.$message.error('请填写必要的表单项！')
            }
            // 执行添加的业务逻辑--------8
            const form = _.cloneDeep(this.addForm)
            form.goods_cat = form.goods_cat.join(',')

            //处理动态参数
            this.manyTableData.forEach(item => {
                const newInfo = {
                    attr_id: item.attr_id,
                    attr_value: item.attr_vals.join(' ')
                }
                this.addForm.attrs.push(newInfo)
            })
            // 处理静态属性
            this.onlyTableData.forEach(item => {
                var data = []
                const newInfo = {attr_id: item.attr_id,
                attr_value: item.attr_vals }
                this.addForm.attrs.push(newInfo)
            })

            form.attrs = this.addForm.attrs
            // console.log(form);

            //发起请求 添加商品  商品的名称，必须是唯一的
            const {data : res} = await this.$http.post('goods',form)

            if(res.meta.status !==201) {
                return this.$message.error('添加商品失败！')
            }
            this.$message.success('添加商品成功！')
            this.$router.push('/goods')            
        })          
      }
  },
  computed: {
      cateId() {
          if(this.addForm.goods_cat.length === 3) {
              return this.addForm.goods_cat[2]
          }
          return null
      }
  }
}
</script>

<style lang="less" scoped>
.el-checkbox{
    margin: 0 15px 0 0 !important;
}
.previewImg{
    width: 100%;
}
.btnAdd{
    margin-top: 15px;
}
</style>
